TO: ALL PERSONS AND ENTITIES WHO PURCHASED OR OTHERWISE ACQUIRED DENDREON COMMON STOCK BETWEEN APRIL 29, 2010, AND AUGUST 3, 2011, INCLUSIVE:

YOU ARE HEREBY NOTIFIED that a proposed settlement has been reached in this action. A hearing will be held with respect to the settlement on August 2, 2013, at 10:00 a.m. before the Honorable James L. Robart in the United States District Court for the Western District of Washington, 700 Stewart Street, Courtroom Suite 14106, Seattle, WA 98101.

The purpose of the hearing is to determine whether the proposed settlement of the securities class action claims asserted in this litigation, pursuant to which Defendants will pay or cause to be paid the sum of $40,000,000.00 in cash into a settlement fund in exchange for the dismissal of the litigation and a release of claims against Defendants and their related persons and entities, should be approved by the Court as fair, reasonable, adequate and in the best interests of the Class, which includes all persons and entities who purchased or otherwise acquired Dendreon common stock between April 29, 2010 and August 3, 2011, inclusive, excluding the Defendants, and their Related Persons (as defined in the Stipulation of Settlement).

If you purchased or otherwise acquired Dendreon common stock at any time between April 29, 2010 and August 3, 2011, inclusive, and were damaged thereby, you may be potentially eligible to share in the distribution of the settlement fund if you submit a claim form no later than September 7, 2013, establishing that you may be entitled to a recovery.

If you purchased or otherwise acquired Dendreon common stock at any time between April 29, 2010 and August 3, 2011, inclusive, and were damaged thereby, you have the right to object to the settlement, the plan of allocation and/or the request by Lead Counsel for an award of attorneys' fees and expenses, or otherwise request to be heard, by submitting for receipt no later than July 12, 2013, a written objection in accordance with the procedures described in a more detailed notice that has been mailed to persons known to be purchasers or other acquirers of Dendreon common stock between April 29, 2010 and August 3, 2011, inclusive. You also have the right to exclude yourself from the class by submitting for receipt no later than July 12, 2013, a written request for exclusion from the Class in accordance with the procedures described in the more detailed notice. If the settlement is approved by the Court, you will be bound by the settlement and the Court's final order and judgment, including the releases provided for in the final order and judgment, unless you submit a timely and valid request to be excluded.

This notice provides only a summary of matters regarding the litigation and the settlement. A detailed notice describing the litigation, the proposed settlement, and the rights of members of the Class to appear in Court at the hearing, to request to be excluded from the Class and/or to object to the settlement, the plan of allocation and/or the request by Lead Counsel for an award of attorneys' fees and expenses has been mailed to persons known to be purchasers or other acquirers of Dendreon common stock between April 29, 2010 and August 3, 2011, inclusive. You may obtain a copy of this notice, a proof of claim form, or other information by writing to the following address or calling the following telephone number:

PLEASE DO NOT CONTACT THE COURT OR THE CLERK'S OFFICE REGARDING THIS NOTICE. Inquiries, other than requests for the detailed notice referenced above and a proof of claim form, may be made to plaintiffs' counsel: